LSAW Steel Pipe

　　The API SPEC 5L specification provides standards for pipe suitable for use in conveying gas, water, and oil in the natural gas and oil industries. The API SPEC 5L covers seamless and welded steel line pipe. It includes plain-end, threaded-end, and belled-end pipe, as well as through-the-flowline (TFL) pipe, and pipe with ends prepared for use with special couplings. 　　PRIME STEEL PIPE API 5L steel pipe comes in a variety of wall thicknesses and is manufactured domestically, to order, to meet our customer’s particular application requirements. We offer both seamless and welded (ERW*) to meet the particular challenges of all transmission environments. 　　 Line pipe grade designations come from API Spec 5L Specification for Line Pipe. Standard Line Pipe has grade designation A and B. Stronger grades have the designation X followed by the specified minimum yield strength of the pipe steel, measured in kilopounds per square inch (abbreviated ksi), e.g. X60 for pipe having a minimum yi...

　　In the production process of thick-walled straight seam steel pipes , it is necessary to perform strict production processes. If the production process is unreasonable or the production equipment is not used properly, deviations will occur. This situation is called misalignment, which clearly leads it is necessary to prevent the cause of the misalignment of thick-walled straight seam steel pipes. 　　What are the causes of the wrong side of thick-walled straight seam steel pipes? 　　1. The thick side straight seam steel pipe has the wrong side, then you should first check whether the sickle of the steel belt is bent, the sickle bending is the main factor causing the wrong side of the steel pipe; 　　2. When the remaining height of the steel strip head-to-tail butt welding seam is relatively large, if the correct processing is not performed during forming, it will easily cause a large misalignment; 　　3. If the shape and dimensional accuracy of the uncut edges of the steel strip are...

　　Features of outer thick tubing : 　　1. Enhance connection strength through upsetting of joints; 　　2. Sealing is achieved through cooperation with thread grease. 　　Disadvantages of the outer thick tubing: 　　1. Low processing efficiency, serious waste of factory capacity; 　　2. Slip failure easily occurs under tensile load; 　　3. Can't meet the requirements of gas seal under higher pressure; 　　4. The performance of the upper shackle is not good and the anti-sticking ability is poor; 　　5. Limited thread repair; 　　6. Difficulty processing accessories such as short sections; 　　7. The tubing order cycle is long, the price remains high.

　　Cold drawn erw steel pipe, which is one of the best choices for the production of multi-stage hydraulic cylinders. Its process is the same as that of precision seamless pipe cold drawing. It is precision drawn by precision resistance welding (ERW) and manufactured with EN. 10305-2 EU mechanical cold drawn carbon steel welded pipe standard. 　　After the electric resistance welded pipe is welded, the whole pipe body is normalized to ensure the homogeneity of the weld and the heat affected zone with the rest of the metallographic structure and mechanical properties; cold drawing and subsequent heat treatment (eliminating internal stress) and the steel pipe have good dimensions. And mechanical properties. 　　After the welded steel pipe is processed by cold drawing and deep processing, a high-quality steel pipe with small dimensional tolerance and good mechanical properties is obtained. 　　In addition, cold drawn welded pipes have significant advantages over cold drawn seamless pipes i...

　　Large diameter seamless steel pipe is over 1000MM, which is made from steel ingot or solid tube, and then processed by hot rolling or cold rolling. Sometimes, the seamless steel pipes is longer or short while using. Short seamless steel pipes can be welded, longer seamless steel pipes can be cut off. Here are three methods of cutting large diameter seamless steel pipes to proper length to meet industry needs. 　　1. By saw machine 　　Saw machine can make neat section which is convenient for welding. The disadvantage is low efficiency. 　　2. By gas cutting 　　Though gas cutting is fast, the disadvantage is presented notched surface which is not good for construction. 　　3. By cnc cutting machine 　　By cnc cutting machine, seamless steel pipes manufacturers will not save a lot cost but also can obtain smooth section of seamless steel pipe which has not much difference from cutting by saw machine. 　　If you are looking for a new range of strong and durable pipes, you have come at...

　　Most of the seamless steel tubes are medium and high carbon alloy steels. After quenching, some supercooled austenite has not been converted into martensite, and remains in the use state as residual austenite, which affects the performance. If it is cooled below zero, it will promote the martensite transformation of retained austenite. Therefore, the essence of cold treatment is to continue quenching. The quenching stress at room temperature and the quenching stress at zero degrees are superimposed. When the superimposed stress exceeds the strength limit of the material, it will form a cold treatment crack. 　　Precaution: 　　(1) Seamless steel pipes are boiled in boiling water for 30-60 minutes before quenching after quenching, which can eliminate 15% -25% quenching internal stress and stabilize residual austenite, and then perform conventional cold processing at -60C, or After -120C cryogenic treatment, the lower the temperature, the more the amount of retained austenite is trans...

　　The difference between ERW straight seam resistance welded steel pipe and LSAW straight seam submerged arc welded (UOE) steel pipe: 　　1. The difference between raw materials and production capacity 　　The raw material of ERW steel pipe is hot rolled steel coil, and the raw material of UOE steel pipe is hot rolled steel plate. Therefore, ERW steel pipe can realize continuous pipeline operation, high production efficiency and low production cost; while UOE steel pipe is processed by steel plate, continuous pipeline operation cannot be realized, production efficiency is low, and production cost is high. 　　The ERW steel pipe is limited by the thickness of the coil. Generally, the maximum thickness that can be produced is 25mm, and the maximum caliber that can be produced is 660mm. The maximum thickness that UOE steel pipe can be produced is 40mm. The maximum production diameter is 1422mm. 　　2. Welding difference 　　No welding wire is required for ERW steel pipes; welding wire is ...

　　High-frequency electric resistance welding (ERW) steel pipe production, internal weld surface treatments are generally incomplete curettage (left weld reinforcement) and complete curettage (scraping will form the inner surface of the groove) in two ways, and the results were not ideal, will affect the overall performance of the steel pipe. Taking into account the thickness of ERW pipe welds, strength and reliability of ultrasonic testing, squeeze through thick welds - calibrating processing, optimized contour shape welds to improve the overall performance of ERW pipe. 　　 ERW steel pipe after welding, excess metal is extruded from the weld area, both inside and outside surfaces of pipe burr formation, commonly known glitches, usually scraper to remove internal and external burrs. In actual production, better quality generally scrape the outer burr, but scraping issues within the burrs are more likely to leave some of the inner surface of the glitches over the formation of a high or...

　　In order to strengthen the borehole wall and ensure continued safe drilling, seal off the oil, gas and water layers, ensure layered testing during exploration and reasonable oil and gas production during the entire mining process, and insert high-strength steel into the drilled well. The process of quality casing and filling cement in the annular space of the wellbore and casing pipe is called cementing operation. 　　Cementing is a key link in the construction of oil and gas wells. Compared with other drilling processes, cementing operations are obviously special. It is a one-time operation. If the quality is not good, it is difficult to remedy under normal circumstances. It is a concealed operation. The main process is downhole and cannot be directly observed during construction. The quality is often determined by the accuracy of the design and the quality of the preparation work. It is also affected by the combination of multiple factors and also affects the subsequent projects; ...

　　1. Tube blank quality 　　 ERW steel pipe special steel has high purity. Through de-S, de-P, de-aeration, Ca treatment and other methods, the S and P content can be controlled below 0.005%, the N content can be controlled below 0.008%, the shape of the inclusions can be controlled to be spherical and the number can be greatly reduced. The C content is controlled below 0.1%, which has good welding performance, and the increase in strength is to prevent the growth of austenite grains by adding trace alloy elements such as Nb, V, Ti, etc., while increasing the gap strengthening to improve the steel Toughness and strength. The billet of SML steel pipe is generally made of A3, 20 steel, 16Mh and other materials. The purity of the material is poor, and the C content is high, generally about 0.2%, which is not conducive to girth welding during construction, and the strength is acceptable. But toughness is poor. 　　ERW steel tube blanks are manufactured by cold-rolling hot-rolled steel str...

　　The processing of seamless square pipes is that the seamless square pipes undergo pressure processing to plastically deform the processed steel (blank, ingot, etc.). According to the seamless square tube processing temperature, the seamless square tube is divided into two types: cold processing and hot processing. The main processing methods of seamless square pipes are: 　　(1) Rolling: The seamless square tube metal billet is passed through the gap (various shapes) of a pair of rotating rolls. The pressure reduction method of reducing the cross-section of the data and increasing the length due to the contraction of the rolls is the consumption of seamless Pipe is a commonly used consumption method, mainly used to consume seamless square pipe profiles, plates, and pipes. It is divided into cold rolling and hot rolling. 　　(2) Forging seamless square tube: a pressure processing method that uses the reciprocating impact of a forging hammer or the pressure of a press to change the bi...

　　The strength and quality of the oil casing pipe is always a concern for everyone, because the quality of the oil casing is one of the important factors affecting China's crude oil production. In fact, the causes of its damage include non-uniform stress, corrosion, and sand formation in the oil layer. And high pressure water injection. Regarding the strength of the oil casing, the API standard does not clearly point out the effects of non-uniform stress, geometric defects of the oil casing, and residual stress on the bearing capacity of the casing on the bearing capacity of the oil casing. Therefore, the impact of these unpredictable conditions makes it difficult for the designer to determine the impact of these factors on the strength of the oil casing. 　　Now, oil casing manufacturers understand that the existing data have analyzed the effects of geometric defects, residual stress, non-uniform ground stress and other factors on the strength of the oil casing. Most literature is...

　　The rolling method is divided into hot rolling, hot extrusion and cold drawing (rolling) of 304 stainless steel seamless pipe. According to the metallographic structure of 304 stainless steel seamless pipe, it is divided into semi-ferrite and semi-martensitic 304 stainless steel seamless pipe, martensitic 304 stainless steel seamless pipe, austenitic 304 stainless steel seamless pipe, austenite -Ferritic 304 stainless steel seamless pipe. 　　1, Hot rolling (extruded seamless steel pipe): round pipe billet → heating → perforation → three-roll diagonal rolling, continuous rolling or extrusion → stripping → sizing (or reducing) → cooling → straightening → hydraulic pressure Test (or flaw detection) → mark 　　2, The rolling method of cold drawn (rolled) seamless steel pipe is more complicated than that of hot rolled (extruded seamless steel pipe). The first three steps of their production process are basically the same. The difference starts from the fourth step. After the blank tube ...

　　The molten steel from the steelmaking furnace is cast into slabs, and the ingots or slabs are press processed into steel (steel products). There are many types of steel, which can be generally divided into four categories: section, plate, tube and wire. 　　 1, sectional steel 　　There are many types of section steel, which is a solid strip steel with a certain cross-sectional shape and size. There are two types of simple and complex sections according to their cross-sectional shapes. The former includes round steel, square steel, flat steel, hexagonal steel and angle steel; the latter includes rails, I-beams, channel steels, window frame steels, and shaped steels. Small round steel with a diameter of 6.5 -9.0mm is called wire. 　 　2, steel plate 　　A steel plate is a flat steel with a wide aspect ratio and a large surface area. According to different thickness, it can be divided into thin plate (thickness <4mm), middle plate (thickness 4-25mm) and thick plate (thickness> 25...

　　There is a wide range of specifications when we talk about steel tubes, then we will review the most relevant and what would be its practical application. 　　 Galvanized steel pipes can be found in thicknesses from 2mm to 3.6mm and in dimensions from 1/2 to 4 inches. This type of tube is ideal for water supply in large structures. Currently there is also a tendency towards building decorative elements with galvanized pipe. 　　The square structural tube is available in thicknesses from 1.5 mm to 3 mm, in black and galvanized steel. This type of pipe is used in structure, as a column for warehouses and industrial buildings, in signaling and as a public lighting post. The construction based on structural steel pipe has a long service life. 　　The structural pipe is also available in rectangular and round version. 　　The round mechanical tube is available in black steel and electroplating, in thicknesses ranging from 0.8mm to 1.5mm. These types of pipes are used for the construction...